The Hardest Copper Is That Kind Of Copper

The hardest copper can only be alloy copper, because pure copper (red copper) is softer, and other metals are added to pure copper to increase its hardness.

Brass is a copper alloy with zinc as the main additive element. It has a beautiful yellow color. Copper zinc binary alloy is called common brass or simple brass. Brass above three yuan is called special brass or complex brass. Zinc containing less than 36% of the brass alloy by solid solution composition, has good cold working performance, such as zinc containing 30% of the brass commonly used to make cartridge, commonly known as cartridge brass or 73 brass. Brass alloys with zinc content between 36 and 42% are composed of and solid solutions, of which the most commonly used is 64 brass with zinc content of 40%.

In order to improve the performance of ordinary brass, other elements such as aluminum, nickel, manganese, tin, silicon and lead are often added. Aluminum can improve the strength, hardness and corrosion resistance of brass, but reduce the plasticity, so it is suitable to be used as condensing pipe and other corrosion resistant parts. Tin can improve the strength of brass and corrosion resistance to seawater, so it is called naval brass, used for Marine thermal equipment and propellers. Lead can improve the cutting performance of brass; This free - cutting brass is often used for clock parts. Brass castings are commonly used to make valves and pipe fittings. The fire hydrant explosion-proof crescent wrench commonly used in ships is made of brass and aluminum.

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